Muon pair production at 52 GeV le radical s le 57 GeV using the AMY Detector at TRISTAN

Miscellaneous · Sun Jan 01 00:00:00 EST 1989

OSTI ID:5835196

Bacala, A M

The reaction e{sup +}e{sup {minus}} {yields} {mu}{sup +}{mu}{sup {minus}} has been observed by the AMY Detector at 52 GeV {le} {radical}s {le} 57 GeV at the TRISTAN storage ring in Tsukuba, Japan. With an integrated luminosity of 18.6 pb{sup {minus}1}, this presents a new test of the standard model of the electroweak interactions in this previously unexplored energy region. The forward-backward charge asymmetry and the cross-section calculated at the various energies show agreement with the standard model predictions. The products of the vector and the axial-vector coupling constants of the electron and muon extracted from these measurements are also consistent with theory. The data were combined at the average energy of {radical}s = 55.2 GeV. The measured asymmetry and cross-section are -34.4 {+-} 7.7% and 29.7 {+-} 2.1 pb respectively. This is in agreement with the standard model prediction of -28.3% for the asymmetry and 29.5 pb for the cross-section. The product of the axial couplings, g{sup e}{sub A}g{sup {mu}}{sub A} = 0.29 {+-} 0.07, and the product of the vector couplings, g{sup e}{sub V}g{sup {mu}}{sub V} = 0.01 {+-} 0.06, agree with the standard model predictions of 0.25 and .002 for these respective constants.

• Research Organization: Louisiana State Univ. and Agricultural and Mechanical Coll., Baton Rouge, LA (USA)
• OSTI ID: 5835196
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
MUONS
PAIR PRODUCTION
BEAM LUMINOSITY
CHARGE INDEPENDENCE
COMPARATIVE EVALUATIONS
COUPLING CONSTANTS
CROSS SECTIONS
RADIATION DETECTORS
STANDARD MODEL
TESTING
TRISTAN STORAGE RINGS
BASIC INTERACTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON-LEPTON INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
PARTICLE INTERACTIONS
PARTICLE MODELS
STORAGE RINGS
UNIFIED GAUGE MODELS
645101* - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties